Gong-Bo Zhao NAOC and Portsmouth Understanding the Accelerating Universe.

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Presentation transcript:

Gong-Bo Zhao NAOC and Portsmouth Understanding the Accelerating Universe

September 13, 2012 COSMO12, Beijing China Nobel Prize 2011

Cosmic Acceleration September 13, 2012 COSMO12, Beijing China Dark Energy Modified Gravity

September 13, 2012 COSMO12, Beijing China Weak Lensing Galaxy Counts ISW KDUST Euclid

September 13, 2012 COSMO12, Beijing China Thirty-Meter Telescope (TMT) DE: Supernovae MG: Galaxy dynamics

DE studies September 13, 2012 COSMO12, Beijing China

Dark Energy Negative pressure: Candidates ： Vacuum energy : w = -1 Dynamical fields: Quintessence w (a)>-1 Phantom w (a)<-1 Quintom w (a) across -1

September 13, 2012 COSMO12, Beijing China GBZ, Xinmin Zhang, Phys.Rev.D81, , 2010 宇宙学参数整体拟合 w(a)=w 0 +w a (1-a) Reconstruct w(a) parametrically Current data Simulated LSST data

September 13, 2012 COSMO12, Beijing China GBZ, Dragan Huterer, Xinmin Zhang Phys.Rev.D 77, (Rapid Communications), 2008 Reconstruct w(a) non-parametrically Real data circa 2008

September 13, 2012 COSMO12, Beijing China GBZ, Crittenden, Pogosian, Zhang (arXiv: , PRL submitted) Real data circa s detection of dynamical dark energy from the latest data!

September 13, 2012 COSMO12, Beijing China

September 13, 2012 COSMO12, Beijing China GBZ, Crittenden, Pogosian, Zhang (arXiv: , PRL submitted) >5 s detection of dynamical dark energy from the mock Euclid data! Real data circa 2012

GR test September 13, 2012 COSMO12, Beijing China

In GR September 13, 2012 COSMO12, Beijing China

In f(R) September 13, 2012 COSMO12, Beijing China lClC

In very dense regions September 13, 2012 COSMO12, Beijing China lClC

September 13, 2012 COSMO12, Beijing China High-density region Normal gravity Low-density region Stronger gravity

September 13, 2012 COSMO12, Beijing China Numerical Simulations GBZ, B.Li, K.Koyama, PRD 11

September 13, 2012 COSMO12, Beijing China z=0, Box=64 Mpc/h Movie produced by Claudio Gheller GRf(R)

September 13, 2012 COSMO12, Beijing China GR

September 13, 2012 COSMO12, Beijing China f(R)

September 13, 2012 COSMO12, Beijing China

So, if GR got modified, there would be a displacement between the optical (stellar) component and the HI (gas component) centroids of the dwarf galaxies! MaNGA, TMT should be able to see it!! September 13, 2012 COSMO12, Beijing China GR TEST 1

First, pick up the unscreened galaxies September 13, 2012 COSMO12, Beijing China A 3D screening map of the galaxies in the SDSS region Cabre, Vikram, GBZ, Jain and Koyama, , JCAP 2012

Then measure the offset! (in progress) September 13, 2012 COSMO12, Beijing China

September 13, 2012 COSMO12, Beijing China Jain and Vanderplas, GR TEST 2: use the rotation curve

September 13, 2012 COSMO12, Beijing China GR TEST 3: Compare the lensing mass to the dynamical mass

Structure formation in GR COSMO12, Beijing China September 13, 2012

Structure formation in f(R) COSMO12, Beijing China September 13, 2012

Dynamical Mass COSMO12, Beijing China September 13, 2012

Dynamical Mass COSMO12, Beijing China September 13, 2012

Dynamical Mass COSMO12, Beijing China Spherical symmetry September 13, 2012

Lensing Mass COSMO12, Beijing China September 13, 2012

Lensing Mass COSMO12, Beijing China September 13, 2012

Lensing Mass COSMO12, Beijing China Spherical symmetry September 13, 2012

COSMO12, Beijing China Mass Difference September 13, 2012

COSMO12, Beijing China September 13, 2012 GBZ, Baojiu Li, Kazuya Koyama ( ,PRL 2011)

COSMO12, Beijing China Clean mass dependence! September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China Large scatter shows the environmental effect!! September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China Apparent environmental dependence!! September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China No screening! September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China Maximum screening Core is better screened September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China Screened purely by environment September 13, 2012

COSMO12, Beijing China September 13, 2012

COSMO12, Beijing China Screening on the edge shows environmental dependence! September 13, 2012

Observationally… COSMO12, Beijing China Lensing MassDynamical Mass September 13, 2012

Measure lensing and dynamical mass for each halo; Divide the sample using D; Compare! COSMO12, Beijing China September 13, 2012

Measure lensing and dynamical mass for each halo; Divide the sample using D; Compare! COSMO12, Beijing China Apply to future data (BOSS, MaNGA, TMT?) September 13, 2012

Summary Using the observables on large scales (CMB, BAO, RSD, etc), the constraint on w(z) will be significantly improved by the data of Planck (2013-), BOSS ( ), DES (2012-), Euclid (2020-); Using the observables on small scales (strong lensing, galaxy dynamics), GR can be tested to an unprecedented precision in the coming years(MaNGA, TMT…) September 13, 2012 COSMO12, Beijing China

September 13, 2012 COSMO12, Beijing China R.G.Crittenden, Gong-Bo Zhao, L.Pogosian, L.Samushia, X.Zhang arXiv: (2011) 简单，准确，可以用于所有类型的天文数据非参数化方法重组 w(a) 未来 Euclid 数据模拟

September 13, 2012 COSMO12, Beijing China Model-independent reconstruction of w Crittenden, Pogosian, GBZ (JCAP 2009) Crittenden, GBZ, Pogosian, Samushia, Zhang (JCAP 2012)

Hide w(z) models in the mock Euclid data September 13, 2012 COSMO12, Beijing China

w reconstructed successfully Crittenden, GBZ, Pogosian, Samushia, Zhang (JCAP 2012) September 13, 2012 COSMO12, Beijing China Straightforward to apply to KDUST data!